anonymous

5 years ago

Trig question: I am being asked to graph one period ending with x=2 pi. I I have graphed it (with no graphing calculator) and do not understand the solution at the end of my book. I think the y min. and y max. should by 1 and -1. Why does the book say it is 1.2 and -1.2?

Well, the book could be wrong, couldn't it? The maximum value of the cosine curve is 1. No question about it. And the minimum value of cosine is -1.
Ahh ... I think the book is giving you the y min and y max of the calculator's WINDOW, not the y min and y max of the curve itself. That would give a little margin around the curve. Does that make work for you? (That IS what the TI calculator window calls the vertical scale.)